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Is there a performance gain in using single quotes vs double quotes in ruby?
... ruby -v
ruby 1.9.3p0 (2011-10-30 revision 33570) [x86_64-darwin11.0.0]
$ cat benchmark_quotes.rb
# As of Ruby 1.9 Benchmark must be required
require 'benchmark'
n = 1000000
Benchmark.bm(15) do |x|
x.report("assign single") { n.times do; c = 'a string'; end}
x.report("assign double") { n.times...
Confused by python file mode “w+”
...
with open('somefile.txt', 'w+') as f:
# Note that f has now been truncated to 0 bytes, so you'll only
# be able to read data that you write after this point
f.write('somedata\n')
f.seek(0) # Important: return to the top of the file before reading, otherwise you'll just read an emp...
Core dumped, but core file is not in the current directory?
...to other file(mycore.BIN) is being redirected to file which i have used to catch stdout & stderr(applog.txt). Is there a good read about this one? Please suggest. Thank you
– mk..
Jun 2 '14 at 7:53
...
How to amend several commits in Git to change author
...ithub.com/articles/changing-author-info, which also adds --tag-name-filter cat to the filter-branch in order to migrate tags to the new history. It also uses --branches --tags instead of --all, which only rewrites branch and tag history and leaves other refs alone (though that probably doesn't make ...
Authenticate with GitHub using a token
I am trying to authenticate with GitHub using a personal access token. In the help files at github, it states to use the cURL method to authenticate ( https://help.github.com/articles/creating-an-access-token-for-command-line-use ). I have tried this, but I still cannot push to GitHub. Please note, ...
List files in local git repo?
...ng the ID/SHA-1 of the directory that you want to explore and then use git cat-file -p [ID/SHA-1 of directory]. For example:
git cat-file -p 14032aabd85b43a058cfc7025dd4fa9dd325ea97
100644 blob b93a4953fff68df523aa7656497ee339d6026d64 glyphicons-halflings-regular.eot
100644 blob 94fb5490a2ed10b2...
Retrieve a single file from a repository
...git archive --remote=ssh://host/pathto/repo.git HEAD README.md
This will cat the contents of the file README.md.
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“Insert if not exists” statement in SQLite
...roceed.
I would advice that you instead design your table so that no duplicates are allowed as explained in @CLs answer below.
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DROP IF EXISTS VS DROP?
...r 5 '12 at 11:31
Mike Sherrill 'Cat Recall'Mike Sherrill 'Cat Recall'
78.5k1616 gold badges103103 silver badges156156 bronze badges
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Minimal web server using netcat
I'm trying to set up a minimal web server using netcat (nc). When the browser calls up localhost:1500, for instance, it should show the result of a function ( date in the example below, but eventually it'll be a python or c program that yields some data).
My little netcat web server needs to be a w...